| Answer | Crossword Clue |
|---|---|
| triumvirate | any group or set of three. |
| headsail | any sail set on a foremast, esp. on a vessel having three or more masts |
| ternions | set or group of three; triad |
| trines | set or group of three; triad |
| ternion | set or group of three; triad |
| trine | set or group of three; triad |
| illites | any of a group of clay minerals, hydrous potassium aluminosilicates, characterized by a three-layer micalike structure and a gray, light green, or yellowish-brown color |
| illite | any of a group of clay minerals, hydrous potassium aluminosilicates, characterized by a three-layer micalike structure and a gray, light green, or yellowish-brown color |
